—, habits of, xlvi, 44.
Rawson, on fires in London, xxxv, 316.
Ray, solar, see [Light.]
Ray, John, some notice of, C. Fox, xxxvi, 223.
Razors, paste for, iv, 199.
—, method of sharpening, xxi, 165.
—, effect of cold on, xxvi, 189.
Record of General Science, R. D. Thomson's, noticed, xxviii, 365; xxxii, 212.
Rectification of the ellipse, xviii, 38.f
Red color in agates, xxxvi, 207.